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Flashcards in ch 7 Deck (19):
1

skeletal system

Axial- 80 bones (skull, vertebral column, thoracic cage) / Appendicular- 126

20% body mass

Bones, cartilages, joints, ligaments

2

Skull

Cranial Bone (8)- Encloses brain in cranial cavity

Facial bone (14)- Framework of face

Site of attachment for head and neck muscle

3

Suture

Sutural Bone- small, extra bone plates located within the sutures of cranial bones

Sutures- jointed areas where flat bones come together

4

Fontanels

Mesenchyme filled space between cranial bones at birth close at 6months- 2 years

5

8 cranial bones

Frontal bone
Parietal bones (2)
Occipital bone
Temporal bones (2)
Sphenoid bone
Ethmoid bone

6

Frontal Bone

Anterior portion of cranium, contains air filled frontal sinous

7

Facial bone

(14)

Framework of face

Cavities for special sense organs for sight, taste, and smell

Openings for air and food passage

Sites of attachment for teeth and muscles of facial expression

8

14 Facial Bones

Mandible
Maxillary bones (maxillae) (2)
Zygomatic bones (2)
Nasal bones (2)
lacrimal bone (2)
palatine bone(2)
vomer
inferior nasal cochea

9

orbit

Root of Orbit-
-lesser wing of sphenoid
-orbital plate of frontal bone

Lateral wall of orbit-
zygomatic process
greater wing of sphenoid

Medial wall-
sphenoid body
orbital plate of ethmoid
frontal process of maxilla
lacrimal bone

Floor of orbit-
orbital process of palatine
orbital surface of maxillary bone
zygomatic bone

10

Hyoid

Lone bone, support tongue with muscle attachment

11

vertebral column

Transmit weight of trunk to lower limbs, Protect spinal cord

flexible curved structure

Cervical-thoracic-lumbar-sacrum-coccyx-

12

Intervertebral Disk

Cushionlike pad composed of 2

Nucleus Pulpous- inner gelatinous nucleus
gives disk elasticity and compressibility

Anulus Fibrosus- Outer collar composed of collagen and fibrocartilage

13

General Vertebral Structure

body (centrum)- anterior weight bearing region

vertebral Arch- Composed of pedicles and laminae that, along with centrum, enclose vertebral foramen

Vertebral Foramina- Together make up vertebral canal for spinal cord

Intervertebral Foramina- Lateral openings between adjacent vertebrae for spinal nerves

14

7 Process per vertebra

Spinous process—projects posteriorly
Transverse processes (2)—project laterally
Superior articular processes (2)—protrude superiorly
Inferior articular processes (2)—protrude inferiorly

15

C1 Atlas

No body or spinous process

Consists of anterior and posterior arches, and two lateral masses

Superior surfaces of lateral masses articulate with occipital condyles

Movement for "Yes"

16

C2 Axis

Dens projects superiorly into anterior arch of atlas

Is "missing" body of atlas

Dens is a pivot for rotation of atlas

Movement for "No"

17

Thoracic Vertebrae

T1 to T12

All articulate with ribs at facets and demifacets

Long, spinous process that points inferiorly

Circular vertebral foramen

Location of articular facets allows rotation of this area of spine

18

Lumbar Vertabrae

L1 to L5

Receives most stress

Short, thick pedicles and laminae

Flat hatchet-shaped spinous processes point posteriorly

Vertebral foramen triangular

Orientation of articular facets locks lumbar vertebrae
together to prevent rotation

19

Sternum

Three fused bones

Manubrium – Superior portion

Articulates with clavicles and ribs 1 and 2

Body (midportion)

Articulates with costal cartilages of ribs 2 through 7

Xiphoid process – Inferior end

Site of muscle attachment

Not ossified until ~age 40